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Hi 62,
Original air dams used in production didn't have part numbers on them.
Service Replacement dams have a part number stamped into the rear side, typically near the right end.
The Reproduction dams are poorly shaped at their right and left ends so that their curve doesn't match the curve in the fiberglass valance.
Regards,
Alan
[QUOTE=Alan 71;1593583864]Hi 62,
Original air dams used in production didn't have part numbers on them.
Service Replacement dams have a part number stamped into the rear side, typically near the right end.
Alan
I have a GM NOS front air dam - will have to check if the # is on the backside - I can't remember if there was a number.